The more references in undergraduate thesis, the better. The number of references is positively related to the amount of information in the paper. Some students think that the more references cited, the more the author pays attention to the citation problem and respects the achievements of other authors. Others think that the more references cited, the greater the moisture in the article, which is the so-called patchwork, moderate citation, and just explain your own problems.

If it is a paper that needs to be submitted and you don't know the quantity requirements, you can find an index of "average citation times" in the index of evaluating journals, which can be used as a reference.